Win a gold medal in a competition to unlock an additional trick
slot. There four competitions for each default skater (one trick
slot awarded per competition) and two competitions for each hidden
skater (three trick slots awarded for first competition and one in
the last competition).

Win two gold medals in pro tour mode with any skater to unlock an
alternate costume for that character.
Complete all the goals in the game and get all the gold medals in
pro tour mode. Enter the skate shop screen and change Tony Hawk's
outfit from A to B to play as the Tony Hawk's Pro Skater 2 version.